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Mathematics-Undefined Slope
The slope of a vertical line is called Undefined slope.
Slope m = (y2-y1) / (x2-x1)
Because in the case of vertical line all the points lies in vertical plane and denominator is zero.
So (x2-x1) = 0
m = (y2-y1) / 0 ; We can not calculate this slope. So slope of the vertical line is Undefined
